| 单词 | once in a blue moon | 
| 释义 | > as lemmasonce in a blue moon  b.   once in a blue moon: rarely, exceptionally. Cf. once in a moon at once adv., conj., adj., and n. Phrases 4. ΚΠ 1833    Athenæum 16 Nov. 780/1  				We are no advocates for the eternal system of producing foreign operas to the exclusion of the works of English composers, but once in a blue moon such a thing may be allowed. 1876    M. E. Braddon Joshua Haggard's Daughter III. i. 4  				A fruit pasty once in a blue moon. 1896    W. Black Briseis vi, in  Harper's Mag. 92 230  				You might once in a blue moon come upon an elderly lady wearing divided skirts. 1928    V. Delmar Bad Girl  i. xii. 133  				Not that it wasn't excusable once in a blue moon. 1955    Times 26 Aug. 7/4  				And when, by some mischance, once in a blue moon, the bell does ring, how startled we are. 1976    National Skat & Sheepshead Q. Mar. 18  				How many of you readers ‘blow’ the big hand—the one that appears once in a blue moon? 2001    J. Boyle Galloway Street 14  				Once in a blue moon I get a penny. < as lemmas  | 
	
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